Spectral analysis of helium poor hot subdwarfs

Details Spectral analysis of helium poor hot subdwarfs Spectral analysis of helium poor hot subdwarfs

Jul 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984esasp.218..273h&link_type=abstract

In ESA Fourth European IUE Conf. p 273-277 (SEE N84-35135 24-88)

Physics

8

Abundance, Helium, Main Sequence Stars, Spectrum Analysis, Stellar Atmospheres, Stellar Evolution, Stellar Gravitation, Stellar Spectra, Stellar Temperature, Subdwarf Stars, Ultraviolet Spectra, Visible Spectrum, Binary Stars, Interstellar Extinction, Spectrograms, Stellar Models

Scientific paper

Ultraviolet and visual spectra of 19 helium poor hot subdwarfs (sdB's and sdOB's) are analyzed for effective temperature, gravity and helium abundance using model atmospheres. The effective temperatures range from 25,000 to 75,000K. Helium is strongly depleted in the sdB's and sdOB's: helium number fraction varies from 0.07% to 6%. From the (log g, Teff)-diagram it is concluded that the subluminous B-stars and most of the sdOB stars are (generalized) helium main sequence stars with a mass = 0.5 M. The helium deficiency of the atmosphere is brought about by diffusion. Three helium poor subdwarfs are discovered to be binaries.

Affiliated with

Also associated with

No associations

Rating

Spectral analysis of helium poor hot subdwarfs does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Spectral analysis of helium poor hot subdwarfs, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Spectral analysis of helium poor hot subdwarfs will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1705813